薄煤层短壁综采工作面石灰岩顶板破断特征及矿压显现规律
Fracture Characteristics and Strata Behavior Laws of Limestone Roof at Short-wall Fully-mechanized Mining Face of Thin Coal Seam
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摘要: 为揭示薄煤层短壁综采工作面石灰岩老顶破断规律，实现顶板管理安全经济，运用理论计算、数值模拟及现场观测等分析了顶板初次破断步距特征及矿压显现规律。研究表明老顶初次、周期来压步距分别为40.7 m及15.5 m，动载系数在1.25左右，石灰岩老顶随工作面推进呈现典型的“O-X”型破断及“见方垮落”特征，采用大功率综采设备推进速度快，来压影响时间、范围明显减小，呈现整体来压特征。Abstract: In order to study the fracture characteristics of limestone roof at short-wall fully-mechanized mining face of thin coal seam and realize roof safety and economical control, theoretical calculation, numerical simulation and field observation were applied to analyze the first fracture distance characteristics and behavior laws. The results demonstrate that the first and periodic weighting distance were 40.7 m and 15.5 m respectively, dynamic load coefficient is about 1.25, the limestone roof appears the characteristics as typical "O-X" model fracture and caving come across square with the working face advancing, the influence time and scope decrease obviously and appear entire weighting type by applying the high power fully-mechanized equipments to enhance the advancing speed.
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